Pigment dispersions, block polymers and manufacturing method therefor

Active Publication Date: 2011-06-09
DAINICHISEIKA COLOR & CHEM MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0030]The process for obtaining the block polymer (high-molecular dispersant) in the present invention does not use any heavy metal, does not absolutely need the purification of the polymer, does not require the synthesis of special compounds, and can readily obtain the target product from only relatively economical materials available on the market. Further, the polymerization conditions are mild, and the polymerization can be conducted under similar conditions as the conventional radical polymerization processes, does not require any special equipment, can use conventional radical polymerization equipment, and is not affected much by water or light. Further, the monomers, solvent and the like to be used do not require purification, and monomers having various functional groups can be used to introduce them into the polymer. In addition, the polymerization degree is very high.
[0031]The block polymer useful as a high-molecular dispersant in the present invention is significantly characterized in that its polymerization is initiated from the initiating compound. By adding and polymerizing the monomer b after the polymerization and formation of the polymer block A from the monomer a, the A-D block polymer having the polymer block D, which contains glycidyl groups or isocyanate groups, can be obtained. By further polymerizing the monomer a to form the C block, the A-D-C triblock polymer can be obtained.
[0032]By further adding and reac

Problems solved by technology

However, the above-described living radical polymerization processes are accompanied by such problems as will be described next.
Moreover, with this polymerization process, polymerization of a methacrylate monomer is not allowed to proceed in general.
Even with this method,

Method used

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  • Pigment dispersions, block polymers and manufacturing method therefor
  • Pigment dispersions, block polymers and manufacturing method therefor
  • Pigment dispersions, block polymers and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

synthesis example 1

Synthesis of A-B Block Polymer Having Glycidyl Groups Reacted with Di-n-butylamine

[0107]Into a reaction vessel fitted with a stirrer, reflux condenser, thermometer and nitrogen inlet tube, propylene glycol monomethyl ether acetate (hereinafter abbreviated as “PGMAc”) (100 parts), iodine (3.0 parts), 2,2′-azobis(isobutyronitrile) (hereinafter abbreviated as “AIBN”) (5.9 parts), methyl methacrylate (hereinafter abbreviated as “MMA”) (75 parts) and diethyl phosphite (hereinafter abbreviated as “DEP”) (0.766 parts) were charged, and with nitrogen bubbling, polymerization was conducted at 80° C. for 2 hours to form an A block. The polymerization mixture was sampled, and its solid content was measured. The polymerization conversion rate as calculated from the nonvolatile content was 100%. Further, Mn as measured by a visible light detector (hereinafter abbreviated as “RI”) of GPC was 2,700, and PDI was 1.22.

[0108]Glycidyl methacrylate (hereinafter abbreviated as “GMA”) (17.8 parts) was th...

synthesis example 2

Synthesis of A-B Block Polymer Having Glycidyl Groups Reacted with Diphenylamine

[0110]Into a similar reaction vessel as in Synthesis Example 1, PGMAc (150 parts), iodine (3.0 parts), AIBN (5.9 parts), benzyl methacrylate (hereinafter abbreviated as “BzMA”) (132.2 parts) and N-iodosuccinimide (hereinafter abbreviated as “NIS”) (0.067 parts) were charged, and with nitrogen bubbling, polymerization was conducted at 80° C. for 3 hours to form an A block. The polymerization mixture was sampled, and its solid content was measured. The polymerization conversion rate as calculated from the nonvolatile content was 100%. Mn as measured by RI at that time was 5,400, and PDI was 1.24. An absorption aromatic ring was observed when measured by an ultraviolet detector (measurement wavelength: 254 nm, hereinafter abbreviated as “UV”). Mn as measured by UV was 5,300, and PDI was 1.25.

[0111]GMA (35.6 parts) was then added, and polymerization was conducted further at the same temperature for 3 hours t...

synthesis example 3

Synthesis of A-B Block Polymer Having Glycidyl Groups Reacted with Di-n-butylamine

[0113]Into a similar reaction vessel as in Synthesis Example 1, PGMAc (250 parts), iodine (6.0 parts), AIBN (10.8 parts), n-butyl methacrylate (hereinafter abbreviated as “BMA”) (213.3 parts) and NIS (0.134 parts) were charged, and with nitrogen bubbling, polymerization was conducted at 80° C. for 3 hours to form an A block. The polymerization mixture was sampled, and its solid content was measured. The polymerization conversion rate as calculated from the nonvolatile content was 100%. Mn as measured by RI of GPC at that time was 4,000, and PDI was 1.26.

[0114]GMA (42.6 parts) was then added, and polymerization was conducted further at the same temperature for 3 hours to form a D block. The polymerization mixture was sampled, and its solid content was measured. The polymerization conversion rate as calculated from the nonvolatile content was 99%. Mn as measured at that time by RI of GPC was 5,500, and P...

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Abstract

Disclosed is a pigment dispersion containing at least a pigment, a liquid medium and a high-molecular dispersant. The high-molecular dispersant is a block polymer represented by A-B or A-B-C, in which A, B and C each represent a polymer block and the A and C blocks may be the same or different. The block polymer and its production process are also disclosed. The high-molecular dispersant is free of problems of a smell, coloration, a heavy metal and cost, and its use can provide a pigment dispersion excellent in the dispersion stability of a pigment.

Description

TECHNICAL FIELD[0001]This invention relates to a block polymer which can be obtained by a novel polymerization process and is controlled in structure. The novel polymerization process is easy to polymerize monomers, assures a good polymerization yield, uses materials which are economical and do not place much load on the environment, and requires no special compound or compounds. The present invention is also concerned with a pigment dispersion containing the block polymer as a high-molecular dispersant and also with its use.BACKGROUND ART[0002]Acrylic copolymers, a kind of polymers formed from ethylenically-unsaturated monomers (which may hereinafter be called simply “monomers”), are used in a variety of fields such as high-molecular dispersants, paints, binders, and self-adhesives. Many of these acrylic copolymers are produced by general radical polymerization. According to such general radical polymerization, however, a termination reaction such as the recombination of propagatin...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L39/00C09D11/00C09D163/00C09D139/00C08F269/00C08F271/00C08F8/00C08F297/00C09D17/00
CPCC08F297/00C08L53/00C09D7/007C09D11/10C09D17/003C08F293/005C09D153/00C08L2666/02C09D7/41C08F8/00C09B67/0084C09D17/00
Inventor MURAKAMI, YOSHIKAZUSHIMANAKA, HIROYUKIHITOTSUYANAGI, TOSHIYUKITSUCHIDA, SHINYAGOTO, ATSUSHITSUJII, YOSHINOBUFUKUDA, TAKESHI
Owner DAINICHISEIKA COLOR & CHEM MFG CO LTD
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